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In this lesson we will talk about other working conditions of OLED screens

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detection

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Detection is called ID on the circuit, or DET, or both appear at the same time

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For example, this mobile phone,

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its detection is called LCD_ID_DET

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The signal begins with GPIO is also detection

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Generally there are two line channels,

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only one channel is shown here

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It mainly reflects the manufacturer information of the screen

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During the maintenance, after booting,

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if the screen is not detected, the screen is not bright

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Its damage will directly lead to a black screen,

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the screen does not display

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OK, this is the detection

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Let's look at another working condition of it,

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the bus, or the communication protocol

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It mainly transmits image data,

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which is the picture on the mobile phone screen,

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mainly through MIPI bus or DSI bus

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DSI is usually marked on the drawing

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DATA refers to the transmission data, CLK is the clock

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LANE refers to the transmission channel of data

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EMI is anti-electromagnetic interference,

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which means that there are EMI components connected in the circuits

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between the display screen and the CPU

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Another signal is the synchronization signal, VSYNC

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Here are a few working conditions of the display

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Let's summarize, there are 5 types of working conditions

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No matter which working condition goes wrong,

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it will directly lead to a black screen,

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that is, the screen does not display

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For example, if there is a short circuit or an open circuit in the synchronization,

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the mobile phone will not display

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For example, whether it is detection or reset,

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if there is a short circuit, the screen will not be displayed

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OK, here are the working conditions of the display

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Okay, that's it for this lesson